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Proof step 1 from proof prefixn-shift-right (conclusion)

⊦ # x0 ≤ n → prefixn(n, x0 + x1) = x0 + prefixn(n - # x0, x1)

System applied rule normalize

And obtained the following new goals

Proof step 2:
# x0 ≤ n ⊦ prefixn(n, x0 + x1) = x0 + prefixn(n - # x0, x1)

Rule argument

Additional information